@inproceedings{ijcai2003p180,
  title     = {Layered Mereotopology},
  author    = {Donnelly, Maureen},
  booktitle = {Proceedings of the Eighteenth International Joint Conference on
               Artificial Intelligence, {IJCAI-03}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Georg Gottlob},
  pages     = {1269--1273},
  year      = {2003},
  url       = {https://ijcai.org/proceedings/2003/180},
}